core sequences (start):
core sequences, (01): A000001 (groups), A000002 (Kolakoski), A000004 (0's), A000005 (divisors), A000007 (0^n), A000009 (distinct partitions), A000010 (totient), A000012 (1's), A000014 (series-reduced trees), A000019 (prim. perm. groups), A000027 (natural numbers), A000029 (necklaces), A000031 (necklaces), A000032 (Lucas), A000035 (0101...)
core sequences, (02): A000040 (primes), A000041 (partitions), A000043 (Mersenne), A000045 (Fibonacci), A001519 and A001906 (Fibonacci bisections), A000048 (necklaces), A000055 (trees), A000058 (Sylvester), A000069 (odious), A000079 (2^n), A000081 (rooted trees), A000085 (self-inverse perms.), A000088 (graphs), A000105 (polyominoes), A000108 (Catalan), A000109 (polyhedra)
core sequences, (03): A000110 (Bell), A000111 (Euler), A000112 (posets), A000120 (1's in n), A000123 (binary partitions), A000124 (Lazy Caterer), A000129 (Pell), A000140 (Kendall-Mann), A000142 (n!), A000161 (partitions into 2 squares), A000166 (derangements), A000169 (labeled rooted trees)
core sequences, (04): A000182 (tangent), A000203 (sigma), A000204 (Lucas), A000217 (triangular), A000219 (planar partitions), A000225 (2^n-1), A000244 (3^n), A000262 (sets of lists), A000272 (n^(n-2)), A000273 (directed graphs), A000290 (n^2), A000292 (tetrahedral)
core sequences, (05): A000302 (4^n), A000311 (Schroeder's fourth), A000312 (mappings), A000326 (pentagonal), A000330 (square pyramidal), A000364 (Euler or secant), A000521 (j), A000578 (n^3), A000583 (n^4), A000593 (sum odd divisors), A000594 (Ramanujan tau), A000602 (hydrocarbons), A000609 (threshold functions), A000670 (preferential arrangements)
core sequences, (06): A000688 (abelian groups), A000720 (pi(n)), A000793 (Landau), A000796 (Pi), A000798 (quasi-orders or topologies), A000961 (prime powers), A000984 (C(2n,n)), A001003 (Schroeder's second problem), A001006 (Motzkin), A001037 (irreducible polynomials), A001045 (Jacobsthal), A001065 (sum of divisors), A001113 (e), A001147 (double factorials), A001157 (sum of squares of divisors), A001190 (Wedderburn-Etherington), A001221 (omega), A001222 (Omega), A001285 (Thue-Morse), A001333 (sqrt(2))
core sequences, (07): A001349 (connected graphs), A001358 (semiprimes), A001405 (C(n,n/2)), A001462 (Golomb), A001477 (integers), A001478 (negatives), A001481 (sums of 2 squares), A001489 (negatives), A001511 (ruler function), A001615 (sublattices), A001699 (binary trees), A001700 (C(2n+1, n+1)), A001764 (C3n,n)/(2n+1)), A001969 (evil), A002033 (perfect partitions), A002083 (Narayana-Zidek-Capell), A002106 (transitive perm. groups), A002110 (primorials), A002113 (palindromes), A002275 (repunits)
core sequences, (08): A002322 (psi), A002378 (pronic), A002426 (central trinomial coefficients), A002487 (Stern), A002530 (sqrt(3)), A002531 (sqrt(3)), A002572 (binary rooted trees), A002620 (quarter-squares), A002654 (re: sums of squares), A002658 (3-trees), A002808 (composites), A003136 (Loeschian), A003418 (lcm), A003484 (Hurwitz-Radon), A004011 (D_4)
core sequences, (09): A004526 (ints repeated), A005036 (dissections), A005100 (deficient), A005101 (abundant), A005117 (square-free), A005130 (Robbins), A005230 (Stern), A005408 (odd), A005470 (planar graphs), A005588 (binary rooted trees), A005811 (runs in n), A005843 (even), A006318 (royal paths or Schroeder numbers), A006530 (largest prime factor)
core sequences, (10): A006882 (n!!), A006894 (3-trees), A006966 (lattices), A007318 (Pascal's triangle), A008275 (Stirling 1), A008277 (Stirling 2), A008292 (Eulerian), A008683 (Moebius), A010060 (Thue-Morse), A018252 (nonprimes), A020639 (smallest prime factor), A020652 (fractal), A020653 (fractal), A027641 (Bernoulli), A027642 (Bernoulli), A035099 (j_2), A038566 (fractal), A038567 (fractal), A038568 (fractal), A038569 (fractal), A049310 (Chebyshev)
core sequences, (11): A070939 (binary length), A074206 (ordered factorizations), A104725 (complementing systems)
corners: A006330 , A006332 , A006333 , A006334
correlations: A005434
correlations: see also (1) A006606 A010559 A010560 A010561 A010562 A010563 A010564 A010565 A045690 A045691 A045692 A045693
correlations: see also (2) A045694 A045695 A045696 A045697 A053043
cos(nx): A028297 (table)
cos(x):: A001250 , A003701 , A000795 , A005766 , A003703 , A005647 , A005046 , A002084 , A003709 , A003728 , A003710 , A002085 , A003711
cosec(x), Taylor series for: A036280 */A036281 *, A001896 */A001897 *
cosecant numbers: see cosec(x)
cosh x / cos x, Taylor series for: A000795 *, A005647
cosh(x):: A002459 , A003727 , A003719 , A003700 , A003702
Costas arrays: A008404 *, A001440 *, A001441 *, A001442 , A008403
cot(x), Taylor series for: A002431 */A036278 *
cotangent numbers: A002431 */A036278 *
Cotes numbers: are called Cotesian numbers in OEIS
Cotesian numbers: A100640 /A100641 , A100640 /A100641 , A100643 /A100644 , A100645 /A100646 , A100647 /A100648 , A002176 , A002177 , A002178 , A002179
cototient(n): A051953
counter moving puzzle: A004138
counting numbers: A000027 *
covering codes: see codes, covering
covering designs: see covering numbers
covering numbers , (start):
covering numbers, C(v,k,t) is the smallest number of k-subsets of an n-set such that every t-subset is contained in at least one of the k-subsets.
covering numbers: (1) A011975 A011976 A011977 A011978 A011979 A011980 A011981 A011982 A011983 A011984 A011985 A011986
covering numbers: (2) A011987 A011988 A011989 A011990 A066009 A066010 A066011 A066019 A066040 A066041 A066137 A066140
covering numbers: (3) A066225 A066701
covering numbers: on-line tables of: La Jolla Repository of Coverings
covering radius of codes: see codes, covering
covers of an n-set (1): A003465 *, A007537 *, A035348 *, A046165 *, A049055 *, A049056 *, A055080 *
covers of an n-set (2): A005771 , A005744 , A005745 , A005746 , A005747 , A005748 , A005783 , A005784 , A005785 , A005786 , A055066 , A003465
covers of an n-set (3): A003467 , A003468 , A003469 , A003486
Coxeter-Todd 12-dimensional lattice: A004010 *
Critical exponents:: A007181 , A007180
Croatian: A056597
Croatian: see also Index entries for sequences related to number of letters in n
crossing a road: A005315 *
crossing a road: see also meanders
crossing number, rectlinear: see rectilinear crossing number
crossing numbers of graphs: A000241 *, A007333 , A014540 , A030179
crystal ball sequences , (start):
crystal ball sequences: (1) A001360 A001361 A001845 A001846 A001847 A001848 A001849 A003215 A005891 A005902 A007202 A007204
crystal ball sequences: (2) A007904 A008349 A008356 A008358 A008360 A008362 A008377 A008379 A008384 A008386 A008388 A008390
crystal ball sequences: (3) A008392 A008394 A008396 A008398 A008400 A008402 A008417 A008419 A008421 A008577 A008580 A008922
crystal ball sequences: (4) A010025
Crystal classes:: A004028 , A004027 , A004032 , A004031
crystallographic groups: see groups, crystallographic
crystobalite lattice: A005392